What is Invariant Good For?

[Walter Bright]

Paul D. Anderson wrote:
> I know we went round and round regarding this keyword and Walter's
> right -- at some point you just have to make a decision and go with
> it. But when there's so much complaint about the decision it may be
> time to reconsider.

I guarantee it that if "invariant" is changed to something else, an 
alternate set of people will rise and say it's now screwed up :-) 
because, in reality, there is no right answer.